Home Forum Ask A Member 1929 Johnson Model J-25 Plug Wire

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  • #259274
    Buccaneer
    Participant

      US Member

      I pulled the magneto apart today on the subject motor.
      It has the plug wire going into the bottom of the mag plate
      through a knurled bakelite nut and glass tube. It was still
      potted in tar. Unsure if it’s been apart before or not, but
      the knurl on the nut looks a little chewed up, and there’s
      a little chunk broke out of one end of the glass tube.
      Possible I broke it. Also, I found no spring as Tubs described
      in a prior post (below) He references a photo of “how” he
      put his back together, but said photo is no longer on the thread.

      To Tubs, or anyone, what’s the best way to attach a new coil wire?
      Similar to original, or try to solder it to the secondary button?
      The old plug wire that was in it had the end of the inner core bent
      over, touching the secondary button on the coil. I’m not sure
      if mine is suppose to have a spring, and if so, just how it worked.

      +++++++++++++++++++++++

      1924 Johnson Mod B
      Post #252911

      First challenge is the remove the wire nuts.
      They are easily broken and difficult to replace.
      Second, you’ll find that where the wires connect to the coil is
      sealed with Tar. A heat gun will soften the tar enough so that
      you can remove the coil. Originally the connection is made
      with springs inside glass tubes. Most people don’t notice those
      parts were even in there as they get lost in the tar when removing
      it. Kerosene works as well as anything to clean up the parts.
      Picture shows how I connect the new wires. I don’t think too
      many people replace the tar once its removed.
      Tubs

      ============
      My J-25 Magneto

      DSCN3469
      DSCN3472

      Prepare to be boarded!

      #259282
      bobw
      Participant

        US Member

        I think this is the picture of the “alternate” attachment that Tubs had posted.

        Tubs – no copyright infringement intended!

        Alternate-Wire-Termination

        Bob

        1937 Champion D2C Deluxe Lite Twin
        1954 Johnson CD-11
        1957 Evinrude Fastwin 18
        1958 Johnson QD-19
        1958 Johnson FD-12
        1959 Johnson QD-20

        “Every 20 minute job is only a broken bolt away from a 3-day project.”
        "Every time you remove a broken or seized bolt an angel gets his wings."

        #259288
        Buccaneer
        Participant

          US Member

          Thanks Bob. That’s a slightly different beast, being a twin cylinder.
          I just searched “glass tube” and that post came up.

          Prepare to be boarded!

          #259305
          The Boat House
          Participant



            Thanks Bob for providing that for Tom.
            I did both an A and a A-25 that like that
            and it seem to work OK. That little spring
            is easy to miss. I’m electrically challenged
            and have no understanding of how any
            electrical component functions. For those
            that are knowledgeable, what could be the
            purpose of this little spring to make the
            connection? Its quite a bit smaller than the
            plug wire. Could this be some Flintstone
            attempt at a resistor to increase the spark
            at the plug. It doesn’t make sense to me
            but those folks were way smarter than
            they often get credit for so I’m sure they
            had a reason. Your thoughts?
            Tubs
            .

            #259307
            Buccaneer
            Participant

              US Member

              Thanks for posting that spring tubs. I’ll dig around the waste tar a little
              to see if the baby (spring) got thrown out with the bath water.

              The spring looks like an attempt to insure electrical contact with the
              secondary button. You wouldn’t think it would hold up, or be too effective,
              but I did have continuity with the ohm meter from the plug terminal
              to the windings, before I tore it apart.
              FYI for anyone whose curious, The primary ohms on the coil were .1 K, secondary 5.2K.

              Perhaps I’ll solder a brass tab onto the secondary button and attach the plug wire
              like you did. Seems to me I may have done something similar on an A-45 or similar motor.

              Prepare to be boarded!

              #259308
              The Boat House
              Participant



                I didn’t use any solder. Just have tension against
                the tabs on the coil. Thought I might put the tubes
                and springs back in one day but that motor has
                moved on. Soldering probably would have been a
                good idea seeing that the tubes and springs didn’t
                return.
                Tubs
                .

                #259327
                Buccaneer
                Participant

                  US Member

                  I opted to install the new plug wire similar to the original setup,
                  with a few changes.

                  I never found the old contact spring, but assume there was one there.
                  I dug through my stash of springs and altered a compression spring to fit.
                  I later trimmed the outboard end of the spring shorter than the photo,
                  as I was afraid it could arc on the mag plate.

                  I soldered the end of the plug wire to the spring.
                  The old rubber bushing under the knurled nut was shot, so I made one
                  that seem to work good, out of an old style, hard rubber faucet washer,
                  that already had the correct taper to fit in the knurled nut correctly.
                  I had to drill the hole in the rubber washer out bigger, to 9/32″, so the
                  plug wire was a snug fit inside of the washer. When the knurled nut is
                  tightened down, it seem to hold the wire fixed tightly in position.

                  I wrapped electrical tape around the spring (inside of the original glass
                  insulating tube), leaving the end of the spring bare, as to contact the
                  secondary button on the coil. Before installing it, I put a generous amount
                  of silicone grease on the secondary button and inside of the spring,
                  to prevent corrosion. For extra luck, I used some liquid tape around each
                  end of the glass tube to help keep moister out, and put some around the
                  plug wire inside of the knurled nut.

                  After all said and done, I rechecked the ohms, and got the same reading as
                  in the one photo.
                  Time will tell if it’s successful…… but then again, I’m not even sure it’s going to have
                  enough compression to be a runner.

                  DSCN3473
                  DSCN3474
                  DSCN3476
                  DSCN3475

                  Prepare to be boarded!

                  #259348
                  bobw
                  Participant

                    US Member

                    Looks like a very good fix.   Let us know how it goes when you run the first test fire.

                    Bob

                    1937 Champion D2C Deluxe Lite Twin
                    1954 Johnson CD-11
                    1957 Evinrude Fastwin 18
                    1958 Johnson QD-19
                    1958 Johnson FD-12
                    1959 Johnson QD-20

                    “Every 20 minute job is only a broken bolt away from a 3-day project.”
                    "Every time you remove a broken or seized bolt an angel gets his wings."

                    #259380
                    Buccaneer
                    Participant

                      US Member

                      I finished up the magneto today….. I hope.
                      I tore apart the old condenser can. If I had this one
                      to do over, I would not have cut the back end of the can off
                      with the Dremel. Once I had the end opened up, I was not
                      able to extract the guts, as there’s a solid 1/4″ brass round stock
                      going down the entire center length of the condenser.
                      The Bakelite & brass business end that has the terminal was soldered
                      to the can. Ended up heating up the can with the little torch and pulled
                      it apart, with no apparent damage to the Bakelite.
                      Then was able to hacksaw the guts off close to the terminal end and finish
                      removing the guts.
                      A tiny hole was drilled along side of the brass terminal threaded hole,
                      for the .1 mfd capacitor wire to run thru.
                      Another small hole was drilled thru the condenser can end that I cut off,
                      for the other capacitor lead to exit and be soldered to the can as a ground.
                      Not as pretty as I hoped, but hopefully it works.
                      DSCN3481
                      DSCN3482

                      I started on the lower unit next. From external appearances, it appeared
                      to be in good shape.
                      DSCN3483

                      I’m not sure how well it pumped water last time run, but pretty sure
                      the water pump piston spring should not be seen in this photo.
                      What can I make a new piston out of?
                      DSCN3486

                      Prepare to be boarded!

                      #259386
                      Buccaneer
                      Participant

                        US Member

                        After I separated the driveshaft tube from the gear case I tried to get
                        the driveshaft removed from the gear case. There’s a coupler on
                        the driveshaft with two visible drive pins in it.
                        As I attempted to remove the lower “big” pin on the end of the coupler,
                        (without any success), I noticed a “spring band” just below, and
                        another drive pin underneath the band. This is apparently the
                        correct way to remove the drive shaft.
                        I’ll have to inspect the driveshaft with coupler for “trueness”, as
                        it almost seems that there’s a wobble when spun over by hand.
                        DSCN3487
                        DSCN3492

                        Looking down the driveshaft tube at the powerhead mount flange,
                        there’s two water lines inside the tube, both plumbed to the flange,
                        and hence the powerhead.
                        The feed tube connects to the piston pump, via an external tubing.
                        The outlet tube shoots out the side of the driveshaft tube, above the
                        water line.
                        All I know for today.
                        DSCN3489

                        Prepare to be boarded!

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